* {
    margin: 0;
    padding: 0;
}
body{
    display: flex;
    flex-direction: column;
}
html,body{
    width:100%;
    height:100%;
}
body{
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -khtml-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    }
.img{
    display: inline-block;
    width:5%;
    height:50px;
    background: darkorange;
    vertical-align: middle;
    line-height: 50px;
    text-align: center;
    font-size: 20px;
    margin-right:2%;
    margin-left:2%;
   
}
.header{
    height:50px;
    margin-bottom:40px;
    width:90%;
    margin-left:1%;
}
.layout{
    display: flex;
    flex-direction:column;;
    flex: 1;
    width:100%;
    overflow: auto;
}
.title-big{
    display: inline-block;
    width:75%;
    text-align: center;
   font-weight: 500;
   font-size:40px;
   
}
.contain {
    padding: 0 5%;
    margin-bottom:30px;
    display: none;
   
}
.descript{
   width:90%;
   margin-left:5%;
   font-size:30px;
   font-family: "微软雅黑"；
}
.article{
    width:90%;
    margin: 0 3%;
    font-size:20px;
}
.green{
    color: green;
    font-size: 20px;
}
.red{
    color:red;
    font-size:20px;
}

.title{
    font-size: 30px;
    font-style:italic; 
    color:red;
}

.back {
    color: darkcyan;
}

.linear {

    background-image: repeating-linear-gradient(red 0%, red 10%, green 10%, green 20%,blue 20%,blue 30%);
}

.linear-two{
    background-image: linear-gradient(red 50%, blue 50%); 
    background-size: 100% 20%;
    background-repeat:repeat;
}
.step{
    width:100%;
    height:200px;
    display:block;
    margin-bottom:10px;
}
.step2-1{
    background-image: repeating-linear-gradient(red 0%, red 10%,white 10%, white 20%);

}
.step2-2{
    width:200px;
    background-image: repeating-linear-gradient(red 0%, red 10%, rgba(0, 0, 0, 0) 10%, rgba(0, 0, 0, 0) 20%),
    repeating-linear-gradient(to right,red 0%, red 10%, rgba(0, 0, 0, 0) 10%, rgba(0, 0, 0, 0) 20%);
   }

.step2-3{
    width:200px;
    background-image:
    repeating-linear-gradient(red 0%, red 1%, rgba(0, 0, 0, 0) 1%, rgba(0, 0, 0, 0) 10%),
   repeating-linear-gradient(to right, red 0%, red 1%, rgba(0, 0, 0, 0) 1%, rgba(0, 0, 0, 0) 10%);
  
 
 }
 .step2-4{
    width:200px;
    background-image:
    repeating-linear-gradient(60deg, red 0%, red 1%, rgba(0, 0, 0, 0) 1%, rgba(0, 0, 0, 0) 10%), 
    repeating-linear-gradient(-60deg, red 0%, red 1%, rgba(0, 0, 0, 0) 1%, rgba(0, 0, 0, 0) 10%);
 }
 .step3-3{
    background-image: linear-gradient(to right, red 50%, blue 50%);
 }
 